using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Volo.Abp;
using Volo.Abp.Application.Services;
using Volo.Abp.Domain.Repositories;
using Volo.Abp.Identity;
using Volo.Abp.EventBus.Distributed;
using AuthService.Auth;
using AuthService.Application.Auth;
using AuthService.Application.Tokens;
using AuthService.Application.OAuth;
using AuthService.Application.Security;
using AuthService.Domain.Auth;
using AuthService.Domain.Tokens;
using AuthService.Domain.OAuth;
using AuthService.Domain.Security;
using AuthService.Domain.Events;
using AuthService.Permissions;
using AuthService.Services;

namespace AuthService.Auth
{
    /// <summary>
    /// 认证服务应用服务实现
    /// </summary>
    public class AuthAppService : ApplicationService, IAuthServiceAppService
    {
        private readonly IIdentityUserRepository _userRepository;
        private readonly IdentityUserManager _userManager;
        private readonly IAuthSessionRepository _sessionRepository;
        private readonly ITokenRepository _tokenRepository;
        private readonly IOAuthAuthorizationRepository _oauthAuthorizationRepository;
        private readonly IOAuthClientRepository _oauthClientRepository;
        private readonly ISecurityEventRepository _securityEventRepository;
        private readonly IRiskAssessmentRepository _riskAssessmentRepository;
        private readonly IDistributedEventBus _distributedEventBus;
        private readonly ILogger<AuthAppService> _logger;

        public AuthAppService(
            IIdentityUserRepository userRepository,
            IdentityUserManager userManager,
            IAuthSessionRepository sessionRepository,
            ITokenRepository tokenRepository,
            IOAuthAuthorizationRepository oauthAuthorizationRepository,
            IOAuthClientRepository oauthClientRepository,
            ISecurityEventRepository securityEventRepository,
            IRiskAssessmentRepository riskAssessmentRepository,
            IDistributedEventBus distributedEventBus,
            ILogger<AuthAppService> logger)
        {
            _userRepository = userRepository;
            _userManager = userManager;
            _sessionRepository = sessionRepository;
            _tokenRepository = tokenRepository;
            _oauthAuthorizationRepository = oauthAuthorizationRepository;
            _oauthClientRepository = oauthClientRepository;
            _securityEventRepository = securityEventRepository;
            _riskAssessmentRepository = riskAssessmentRepository;
            _distributedEventBus = distributedEventBus;
            _logger = logger;
        }

        public async Task<LoginResultDto> LoginAsync(LoginRequestDto input)
        {
            _logger.LogInformation("用户登录: {Username}", input.Username);

            // 简化实现，实际应该验证用户凭据
            var result = new LoginResultDto
            {
                AccessToken = "sample-access-token",
                RefreshToken = "sample-refresh-token",
                TokenType = "Bearer",
                ExpiresIn = 3600,
                RefreshExpiresIn = 86400,
                UserContext = new UserContextDto
                {
                    UserId = "sample-user-id",
                    Username = input.Username,
                    Email = "user@example.com",
                    Roles = new List<string> { "user" },
                    Permissions = new List<string> { "read" },
                    LoginTime = DateTime.Now,
                    LastActivityTime = DateTime.Now
                }
            };

            // 发布登录事件
            await _distributedEventBus.PublishAsync(new UserLoginEvent
            {
                UserId = Guid.Parse("sample-user-id"),
                UserName = input.Username,
                LoginTime = DateTime.Now,
                IpAddress = "127.0.0.1",
                UserAgent = "sample-agent"
            });

            return result;
        }

        public async Task LogoutAsync(LogoutRequestDto input)
        {
            _logger.LogInformation("用户登出");

            // 简化实现，实际应该清理会话和令牌
            await Task.CompletedTask;

            // 发布登出事件
            await _distributedEventBus.PublishAsync(new UserLogoutEvent
            {
                UserId = Guid.Parse("sample-user-id"),
                UserName = "sample-user",
                LogoutTime = DateTime.Now,
                Reason = "用户主动登出"
            });
        }

        public async Task<RefreshTokenResultDto> RefreshTokenAsync(RefreshTokenRequestDto input)
        {
            _logger.LogInformation("刷新Token");

            return await Task.FromResult(new RefreshTokenResultDto
            {
                AccessToken = "new-access-token",
                RefreshToken = "new-refresh-token",
                TokenType = "Bearer",
                ExpiresIn = 3600,
                RefreshExpiresIn = 86400
            });
        }

        public async Task<TokenValidationResultDto> ValidateTokenAsync(string token)
        {
            _logger.LogInformation("验证Token");

            return await Task.FromResult(new TokenValidationResultDto
            {
                IsValid = true,
                TokenInfo = new TokenInfoDto
                {
                    Active = true,
                    Subject = "sample-user-id",
                    Username = "sample-user",
                    Email = "user@example.com",
                    ExpirationTime = DateTime.Now.AddHours(1)
                }
            });
        }

        public async Task<UserContextDto> GetUserContextAsync(string token)
        {
            _logger.LogInformation("获取用户上下文");

            return await Task.FromResult(new UserContextDto
            {
                UserId = "sample-user-id",
                Username = "sample-user",
                Email = "user@example.com",
                Roles = new List<string> { "user" },
                Permissions = new List<string> { "read" },
                LoginTime = DateTime.Now,
                LastActivityTime = DateTime.Now
            });
        }

        public async Task<AuthenticationConfigurationDto> GetAuthenticationConfigurationAsync()
        {
            _logger.LogInformation("获取认证配置");

            return await Task.FromResult(new AuthenticationConfigurationDto
            {
                EnableTwoFactor = false,
                RequirePasswordChange = false,
                SessionTimeout = 3600,
                MaxConcurrentSessions = 3
            });
        }

        public async Task UpdateAuthenticationConfigurationAsync(UpdateAuthenticationConfigurationRequestDto input)
        {
            _logger.LogInformation("更新认证配置");

            // 简化实现，实际应该更新配置
            await Task.CompletedTask;
        }

        public async Task<BatchOperationResultDto> BatchOperationAsync(BatchOperationRequestDto input)
        {
            _logger.LogInformation("执行批量操作: {Operation}", input.Operation);

            return await Task.FromResult(new BatchOperationResultDto
            {
                Success = true,
                Message = "批量操作完成",
                Results = new Dictionary<string, object>
                {
                    ["processed"] = 10,
                    ["success"] = 9,
                    ["failed"] = 1
                }
            });
        }
    }
}